can b12 injection cause headache does Vitamin B12 deficiency cause symptoms like headaches, fatigue, depressive mood Benefits of Vitamin B12 Shots
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Toxicity from high doses of B12 is fairly unlikely as it is a water-soluble vitamin, so any excess will be flushed out

That is the entire structural difference

Description B12 for Cats (Methylcobalamin) is the neurologically active form of vitamin B12

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Most people start feeling better within a few days to weeks of treatment, but full recovery may take a few months depending on the severity and duration of the deficiency